Physics Current Electricity Level: Misc Level
What is the inductance of a coil produces an emf of 2.60 V when the current in it changes from -31.0 m A to + 25.0 m A in 10.0 m s ?
Chemistry Mole Concept Level: Misc Level
When 3.0 mole Oxygen gas is heated at a constant pressure of 3.25 atm, its temperature increases from 260 K to 285 K. Given that the molar heat capacity of Oxygen at constant pressure is 29.4 J/K mole. Calculate the q (energy), delta H (enthalpy )and the delta U (internal energy ).
Physics Heat & Thermodynamics Level: Misc Level
A sample of a serum of mass 25 g is cooled from 290 K to 275 K at constant pressure by the extraction of 1.2 k J of energy as heat. Calculate q (energy) and delta H (enthalpy) and estimate the heat capacity of the sample.
Chemistry Mole Concept Level: Misc Level
When 229 J of energy is supplied as heat to 3.00 mol Ar (g), the temperature of the sample increases by 2.55 K. Calculate the molar heat capacities at constant volume and constant pressure of the gas.
Physics Ray Optics Level: Misc Level
The left face of a biconvex lens has a radius of curvature of 12.0 cm, and the right face has a radius of curvature of 18.0 cm. The index of refraction of the glass is 1.44. (a) Calculate the focal length of the lens. (b) Calculate the focal length if the radii of curvature of the two faces are interchanged.
Physics Ray Optics Level: Misc Level
A submarine is 300 m horizontally out from the shore and 100 m beneath the surface of the water. A laser beam is sent from the sub so that it strikes the surface of the water at a point 210 m from the shore. If the beam just strikes the top of a building standing directly at the water s edge, find the height of the building.
Physics Wave Optics Level: Misc Level
In a Young s double - slit experiment, a set of parallel slits with a separation of 0.100 mm is illuminated by light having a wavelength of 589 nm and the interference pattern observed on a screen 4.00 m from the slits. (a) What is the difference in path lengths from each of the slits to the screen location of a third -order bright fringe? (b) What is the difference in path lengths from the two slits to the screen location of the third dark fringe away from the center of the pattern?
Physics Wave Optics Level: Misc Level
White light is spread out into its spectral components by a diffraction grating. If the grating has 2 000 lines per centimeter, at what angle does red light of wavelength 640 nm appear in the first -order spectrum?
Physics Ray Optics Level: Misc Level
At what angle above the horizon is the Sun if light from it is completely polarized upon reflection from water?
Physics Ray Optics Level: Misc Level
An object s distance from a convering lens is ten times the focal length. How far is the image from the focal point ? Express the answer as a fraction of the focal length.
Physics Ray Optics Level: Misc Level
In a church choir loft,two parallel walls are 5.30 m apart.The singers stand against the north wall. The organist faces the south wall, sitting 0.800 m away from it.So that she can see the choir,a flat mirror 0.600 m wide is mounted on the south wall,straight in front of the organist.What width of the north wall can she see? (Hint : Draw a top -view diagram to justify your answer.)
Physics Ray Optics Level: Misc Level
Light is incident normally on a 1.00-cm layer of water that lies on top of a flat Lucite plate with a thickness of 0.500 cm. How much more time is required for light to pass through this double layer then is required to traverse the same distance in air (nLucite =1.59)?
Physics Ray Optics Level: Misc Level
A certain kind of glass has an index of refraction of 1.650 for blue light of wavelength 430 nm and an index of 1.615 for red light of wavelength 680 nm. If a beam containing these two colors is incident at angle of 30.00 % on a piece of this, what is the angle between the two beams inside the glass?
Physics Force & Laws Of Motion Level: Misc Level
A) How much energy is required to stop a 3200 Ib car traveling at 60 mi /hr?
B) If this is accomplished in 10 seconds, how much power is expended?
Physics Work,Power & Energy Level: Misc Level
A car coasts down a long hill and then up a smaller one onto a level surface, where it has a speed of 32 ft /sec. If the car started 200 ft. above the lowest point in the track. How far above this lowest point is the level surface?
